Mitsubishi Colt Ralliart. Manual — part 56
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-178
• When the throttle valve control servo relay turns
ON, battery voltage is supplied by the throttle
valve control servo relay (terminal No. 4) to the
engine-ECU <M/T> or engine-CVT-ECU <CVT>
(terminal No. 78).
FUNCTION
• When the ignition switch ON signal is input into
the engine-ECU <M/T> or engine-CVT-ECU
<CVT>, the engine-ECU <M/T> or
engine-CVT-ECU <CVT> turns ON the Throttle
valve control servo.
TROUBLE JUDGMENT
Check Conditions
• After engine starts <M/T>
• Ignition switch is in "ON" position <CVT>.
Judgement Criteria
• Throttle valve control servo supply voltage is 6.0
V or less <M/T>.
• Battery voltage is 8.3 V or more <CVT>.
• The power line voltage of the electronic controlled
throttle system is 6.0 V or less for 0.35 second
<CVT>.
PROBABLE CAUSES
• Failed throttle valve return spring
• Open/short circuit in throttle valve control servo
circuit or loose connector contact.
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS
STEP 1. Connector check: B-121 throttle valve
control servo relay connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Check throttle valve control servo relay
itself.
• Check throttle valve control servo relay (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the throttle valve control servo
relay.
STEP 3. Perform voltage measurement at B-121
throttle valve control servo relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check intermediate connector B-108, and
repair if necessary. if intermediate connector
is normal, Check and repair harness
between B-121 (terminal No. 3) throttle
valve control servo relay connector and
battery.
• Check power supply line for
open/short circuit.
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-179
STEP 4. Perform voltage measurement at B-121
throttle valve control servo relay connector.
• Remove relay, and measure at relay box side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 5 .
STEP 5. Connector check: B-106 engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair harness between B-106
(terminal No. 4) engine control relay
connector and B-121 (terminal No. 1)
throttle valve control servo relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace the connector.
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-180
STEP 6. Perform voltage measurement at A-08
engine-ECU connector or engine-CVT-ECU
connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 123 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Check intermediate connector B-110, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-121 (terminal No. 2)
throttle valve control servo relay connector
and A-08 (terminal No. 123) engine-ECU
connector or engine-CVT-ECU connector.
• Check earthing line for open/short
circuit.
STEP 7. Perform voltage measurement at A-08
engine-ECU connector or engine-CVT-ECU
connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 78 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Go to Step 8 .
AK402725
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121
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130
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136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
AK402725
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106
115
116
117
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119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-181
STEP 8. Check harness between B-121 (terminal
No. 4) throttle valve control servo relay
connector and A-08 (terminal No. 78) engine-ECU
connector or engine-CVT-ECU connector.
NOTE: Before checking harness, check intermediate
connector B-112, and repair if necessary.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair the damaged harness wire.
STEP 9. Connector check: A-08 engine-ECU
connector or engine-CVT-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
• Check earthing line for open/short
circuit.
NO :
Repair or replace the connector.
AK402030
3
2
1
4
Connector: B-121
B-121
AC
B-121
Relay box side
connector
AK402725
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78
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97
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99
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86
87
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90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Main
Index
Group
TOC
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